/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayAbilitySpec.h
Version that takes an ability CDO, this exists for backward compatibility
FGameplayAbilitySpec ( [UGameplayAbility](API\Plugins\GameplayAbilities\Abilities\UGameplayAbility) * InAbility, int32 InLevel, int32 InInputID, [UObject](API\Runtime\CoreUObject\UObject\UObject) * InSourceObject )